Ouranosinc / xclim / 5260644072

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Document freq parameter (#1392)

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### Pull Request Checklist:
- [x] This PR addresses an already opened issue (for bug fixes /
features)
    - This PR fixes #1310
- [ ] Tests for the changes have been added (for bug fixes / features)
- [x] (If applicable) Documentation has been added / updated (for bug
fixes / features)
- [x] CHANGES.rst has been updated (with summary of main changes)
- [x] Link to issue (:issue:`number`) and pull request (:pull:`number`)
has been added

### What kind of change does this PR introduce?

* Add link to pandas offset aliases in indicator docstrings. 
* Add comment in usage notebook about the fact that the freq is given by
pandas offset aliases.

### Does this PR introduce a breaking change?
No

### Other information:

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